The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 08, 1997
Filed:
Jan. 02, 1996
Sung-Dai Moon, Kyeongsangbook-Do, KR;
Daewoo Electronics Co., Ltd., Seoul, KR;
Abstract
The present invention relating to a circulating pump for pressurizing and circulating fluid in a system such as a boiler has an object to provide a circulating pump having an improved shroud of an impeller and suction ring of a pump housing to thereby reduce power loss in a motor and leakage of high pressurized fluid. The circulating pump according to the present invention comprises a motor, an impeller and a pump housing. A motor shaft is supported rotatably and slidably in an axial direction of the motor shaft by a lower bush bearing and an upper bush bearing. A plurality of grooves are symmetrically formed on an annular flange about the center thereof. Each of the grooves is arranged along the theoretical streamline of a vortex flow which is made from the central end toward the outside of the annular flange under the action of centrifugal force occurring according to the rotation thereof. By the plural grooves, fluid that has flowed into the impeller through a clearance between the shroud and the suction ring is pressed outwardly.